Locomotive



June 22 1926.

H. S. BURNHAM gocouo'rrva Filed April 2, 1924 S Sheets-Sheet l TOR WITNESSES June 22 ,1926.

WITNESSES H. S. BURNHAM LOCOIOTIVE Filed April 2. 1924 3 Sheets-Sheet 2 TOR June 2 2 1926. 1,589,361

H. S. BURNHAM LOCOMOTIVE Filed April 2 1924 3 Shuts-Sheet 5 WITNESSES 1 Patented June 22, 1926.

UNITED STATES HARRY s. sumvnsm, or scnmncunx, new You;

LOCOMOTIVE;

Application filed; April 2,

My invention relate generally, to steam locomotives-of the three cylinder type, and, particularly, to the disposition of the inlet and discharge passages of the cylinders thereof. The object of my invention is to overcome the objections experienced in practice due to incomplete or imperfect separation of steam inlets and exhaust passages,- which induces insufficient draft and undue back pressure.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: *igure 1 is a front view, partly in elevation, and partly insection, on the axial lines of the outer steam inlet passages, of the cylinders of a three cylinder locomotive, embodying my invention; Fig. 2, a side view, in elevation, of the same; Fig. 3, an axial section through the steam inlet passages, on one side of the locomotive, which serve to supply two of the three cylinders; Fig. 4, a horizontal section through the exhaust passages of the assembled cylinders; Fig. 5, a front view, with all details excluded except the exhaust passages, and Fig. 6, a plan or top view.

In the practice of my invention, referring descriptively to the specific embodiment thereof which is herein exemplified, the middle cylinder, 1, and the right hand outside cylinder, 1*, are, as heretofore, formed integral with a right hand saddle casting, 2, and the left hand cylinder, 1", is formed integral with an abutting left hand saddle casting, 2 The two saddle castings, when firmly bolted together, form a bed plate, which is suitably shaped at its top to re ceive and support the smoke box of the locomotive boiler, and is adapted to be secured, at its bottom, to the frame members of the locomotive. Distribution valve chests, 3 and 3 are formed in the right hand saddle casting, 2, adjacent to the cylinders, 1 and 1 respectively, and a distribution valve chest, 3", is formed in the left hand saddle casting, 2 adjacent to the cylinder, l 7

A steam inlet passage, 4, is formed in the right hand saddle casting, 2, adjacent to its outer side, and a steam inlet passage, 4", is formed in the left hand saddle casting, 2 adjacent to its outer side. The inlet passage, 4, is divided by a central partition wall, 4*, into two branches, 4 and 4, one of which, 4, leads into the distribution 1924i. 7 Serial No. 703,361.

valve chest, 3, and the other, 4, leads into the distribution valve chest, 3. The steam inlet passage, 4", of the left hand saddle casting, 2, leads into the distribution valve chest, 3, in the usual form. Pipe" inlets 5, 5?, are formed in the steam inlet passage, 4, for the admission of lubricating oil to the distribution'valve chests, 3 and 3 respectively. The location of said inlets on opposite sides of the dividing wall, 4, ensures positive lubrication to the distribution valves, the chests of which are supplied by the steam inlet passage, 4, which is a novel, and substantially important, feature of my invention.

The exhaust steam from the distribution valve chest, 3 is discharged through pas-- sages, 6, leading out of the ends of the chest, and uniting to form an exhaust passage, 6 which is upwardly curved to the top of the right hand saddle casting, 2, and terminates in an outlet in the longitudinal central plane of the locomotive, so that the discharge of exhaust steam will be in a vertical direction. As shown in Fig. 4, the

exhaust passage, 6, is located on one side of the vertical transverse middle plane of the distribution valve chest, 3*, in order to allow sufiicient room for the exhaust passages from the other two distribution valve chests.

The exhaust steam from the distribution I valve chest, 3 is discharged through passages, 6, leading out of the ends of said chest, and uniting to form an exhaust pa sage, 6, which, similarly to the exhaust passage, 6, is upwardly curved to the top of the right hand saddle casting, 2, to an outlet at the top thereof in the longitudinal central plane of the locomotive. The distribution valve chest, 3, exhausts through passages, 6 leading out of its ends, and uniting to form an exhaust passage, 6, having an outlet at the top of the right hand saddle casting, 2, in the same plane as the outlets of the exhaust passages, 6 and 6.

It will be seen that my invention provides a construction in which there is a complete separation of the steam and exhaust passages of the cylinders of a three cylinder locomotive, and a separate and independent system of exhaust passages, for each individual cylinder. The resultant improvement in draft and avoidance of undue back pressure constitutes a substantial advantage in practice.

I claim as my invention and desire to secure by Letters Patent:

1. In a locomotive, the combination of a right hand saddle casting; a middle cylinder and a side cylinder therein; a left hand saddle casting; a side cylinder therein; distribution valve chests, in the saddles, each adjoining one of the cylinders; a steam in let passage leading into the distribution valve chest of theleft hand saddle casting; and a steam inlet passage, divided by a partition wall into two branches, leading into the distribution valve chests of the middle cylinder and the side cylinder, respectively, of the right hand saddle casting.

2. In a locomotive, the combination of a right hand saddle casting a middle cylinder and a side cylinder therein; a left hand saddle casting; a side cylinder therein; distribution valve chests in the saddles, each adjoining one of the cylinders; an exhaust passage, leading from the distribution valve chest of the left hand saddle casting, in the middle transverse plane of said casting, to an upper discharge opening in the right hand saddle casting; and exhaust passages,

adjoining opposite sides of said first specified exhaust passage, and leading from the distribution valve chests of the right hand saddle casting to upper discharge openings therein.

3. In a locomotive, the combination of three cylinders; distribution valve chests, each communicating with one of said cylinders; a steam inlet passage, divided by a partition wall into twobranches, leading independently into two of the distribution valve chests; and an independent steam inlet passage, leading into the third distribution valve chest.

In a locomotive, the combination of three cylinders; distribution valve chests, each communicating with one of said cylinders; a steam inlet passage, divided by a partition wall into two branches, leading independently into two of the distribution valve chests; two lubricating pipe inlets, each leading into one of the branches of the steam inlet passage, and an independent steam inlet passage leading into the third distribution valve chest.

HARRY S. BURNHAM. 

